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Date: Mon, 8 Sep 2008 06:38:44 -0700 (PDT)
From: "Vinod K V (JIRA)" <jira@apache.org>
To: core-dev@hadoop.apache.org
Subject: [jira] Updated: (HADOOP-3581) Prevent memory intensive user tasks
 from taking down nodes
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     [ https://issues.apache.org/jira/browse/HADOOP-3581?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Vinod K V updated HADOOP-3581:
------------------------------

    Attachment: HADOOP-3581.20080908.txt

Addressing the above minor changes.

> Prevent memory intensive user tasks from taking down nodes
> ----------------------------------------------------------
>
>                 Key: HADOOP-3581
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3581
>             Project: Hadoop Core
>          Issue Type: Improvement
>          Components: mapred
>            Reporter: Hemanth Yamijala
>            Assignee: Vinod K V
>         Attachments: HADOOP-3581-final.txt, HADOOP-3581.20080901.2.txt, HADOOP-3581.20080902.txt, HADOOP-3581.20080904.txt, HADOOP-3581.20080905.txt, HADOOP-3581.20080908.txt, HADOOP-3581.6.0.txt, patch_3581_0.1.txt, patch_3581_3.3.txt, patch_3581_4.3.txt, patch_3581_4.4.txt, patch_3581_5.0.txt, patch_3581_5.2.txt
>
>
> Sometimes user Map/Reduce applications can get extremely memory intensive, maybe due to some inadvertent bugs in the user code, or the amount of data processed. When this happens, the user tasks start to interfere with the proper execution of other processes on the node, including other Hadoop daemons like the DataNode and TaskTracker. Thus, the node would become unusable for any Hadoop tasks. There should be a way to prevent such tasks from bringing down the node.

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